Bathtub



FIG. 1 is a top-front-right perspective view of a bathtub showing my new design;

FIG. 2 is a top-front perspective view;

FIG. 3 is a front elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a right side elevational view;

FIG. 6 is a left side elevational view;

FIG. 7 is a longitudinal vertical cross-sectional view taken along line 7—7 of FIG. 8; and,

FIG. 8 is a transverse vertical cross-sectional view taken along line 8—8 of FIG. 7. 

The ornamental design for a bathtub, as shown and described. 